Mapmaker and Indian trader.

Explored and mapped Ohio. Visited London (1752), where he was acquainted with English naturalist Peter Collinson. With Indian agent George Croghan, described bones and skeleton of a “Great Buffalo” (bison) that they had found at a licking place near the Ohio River and supplied information about the “skeletons of six monstrous animals” (probably mastodons) in the same area (1762).